Which statement best describes the relationship between bandwidth and data throughput?

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Bandwidth is the capacity of a communication link to carry data, usually measured in bits per second. Throughput is the actual rate at which useful data is successfully delivered over that link. When you increase bandwidth, you increase the potential amount of data that can flow through the link per second, so, all else being equal, the data transfer rate can rise. In practice, throughput can be lower than bandwidth due to overhead, latency, or congestion, but the key idea is that higher bandwidth expands the maximum possible data flow, which is why this statement is the best description of their relationship.